Boiler attachment



une 5, 1923. 4 l 1,451839 f c1', D HUNTER i Y BOILPR- ATTACHMENT Filed Oct, 3l WPC) smoke box below t Patented June 5, 1923.

UNITED sTATEs PATENT OFFICE.

GEORGE'D. HUNTER, OF BLQOMINGTON, INDINA.

\ nomas ATTACHMENT.

Application Med October 31, 1919.l Serial'No. 334,892.

To all whom z't may concern.'

V`Beit known that I, GEORGE D. HUNTER, a citizen of the United States, residing at Bloomington, in the county of Monroe and State of' ndiana, have invented certain new anduseful Improvements in Boiler lAttachments, of which the following is a specification.

y 'lhe invention vrelates to improvements in steam boilers. y h

'It is an obect of the invention to provide a steam boiler of the vertical type with means to prevent excessive heating of the cone ysheet of the boiler,

vheatr within the boiler smoke waterflineof the boiler.

It is a kfurther objectof theinvention to provide an attachment for boilers in vwhich the `heat is not onl i confined within theli'e water level of the boiler but to also control` the area` ofthe air assage through the smoke box to cause a iiighly'favorable operating condition in the boiler and economize in theuse of fuel. I e Withl this conception in mind the invention,4 comprises an attachment adapted to be box below the placedin the smoke box cfa boiler and conthe `The tube confines the heat within the a6 ,balefenables an equal amount of air to pass .thljoug'h' a'll of the fines to cause a proper sistingof a depending `tube extending well down Atoward the top ofthe boiler fiues and iat'this lower end spaced a regulated distance from a rbaille plate either seated upon ue'slieetorl suspended from the tube.

eI ofltelbox below the water line'and prevents cessye heating of the cone sheet while the combustion of tllefuel and an even bumri.

. form of the invention.

ofthe samewithin the fire box. The dis-A tance between the lower edge of thectile and thgbale may be regulated, and the area of this space shouldnpreferably be about equal to the .combined "arca of all of the boiler tubes so as to enable a 'roper amount of air to passitherethrough. his regulates and controls the draft of the fire box and materially facilitates con'ibustion of the fuel. In the accompanying drawings I haveshown the preferred 'embodiment of the invention.

ln the'drawings:- Y Figure 1 is a cross sectional view, and Fig. 2 is a view of a slightlymodiiied Referring now more particularly to the drawings, the numeral l designates a steam and to confine the vby means of the stay vdesirable to confine the heat below the boiler which is preferably of vertical type and as is commonly used in steamk channeling machines. The boiler has the usual fire box'2, and the series of vertical Hues 3. It is also provided with t-he water chamber 4 and at its upper end 'with the cone sheet 5. A series of stay bolts 6 are disclosed for maintaining the different parts of the boiler in position and the boiler structure per se is, of course, old and well known, and constitutes no part of this invention.

At its -upper end the boileris rovided with a smoke box 7s aced from t e outer walls of thev boiler an fastened in position' bolts 6. Positioned over the cone sheet 5 of the boiler is a cast iron. ring,y 8 to which is attached a hood 9 carrying a Smoke stack 10, a suitable exhaustl pipe 11 leadingjjrom -the engine cylinders orelsewhere d scharging into` the smoke stack.

Inl boilers 'of` this4 character it is highly top ofthe water line ofthe boiler to prevent overheating and destruction of the conesheet. ToV accomplish this I dispose within the smoke box 7 u. tube member 13, rof substantially Vcircular formation havin an olfset'lange 14 by which the tube 1s seated upon thetop ofy the boiler. This tube depends well within the smoke box' and as disclosed in Figure' 1 serves to confine or retain the heat Within the` smoke box below` the water line as indicated vby the reference character X, `andto prevent excessive heat rom destroying the conc sheet. The tube ay be composedof any suitable material, preferably metal, and while the structure herein shown consists of a. tubular member it is, of course, manifest that the tube may tilillteother formations should this be desira e.

the top of the boiler iues is a baille p ate 14 having depending legs or projections 15 seated upon the edges of the large center flue 17 of the boiler and .providing openings 18 between these legs or projections to allow' ,a small portion of heated air to ass out from large center flue under vthe ba e plate. The battle plate is of a material width and extends over a number of the lues, being spaced from the upper edge of the flues to provide an o' ening for the passage of the air passing t rough the fire box and the fines. The Width of the space between the Spec-ed from the tube 13 and seated u on so l .upper edge of the ues and the lower sur- A face of the baiie is about etual to the total areal of those flues vcover-e by the baffle. It will be observed that thebale is spaced .a slight distance from the'loweredge of the depending tube 13 andthe heated air pass-v ing throughthe l'ues takes'the course indicatedby arrows, passing through the area asses through the inner' lues thereby causi ing a'uniform burning of the coal on the alo* ' especiall width '.o

grate and' producing a very natural and even draftJ-'this manifestly materially increasing the efficiency of the furnace.

A very important feature-of the present invention resides in the width of the space between the lower ed e of the tube 13 and the surfaceofthe bale 14, which width as above 'described defines an area whiolris approximately equal to Ytlie1combinfed. area of all of the' flues. This governs the amount lof air that can pass through the tire box and serves to cconomize in the use of fuel, with forced draft boilers. The this space may be so regulated as to always properly control the quantity of .air that should pass through the boiler to the end that the greatest possible economy beI provided lin the use of fuel consistent with a'successful operation of the plant.

In the modified -form of the invention as disclosed in Figure 2 I have shown the baffle plate 14 as being suspended from the tube 13 by-lneans of the hooked or bolted member 19, having threaded lend ortions adapted to receive the nuts 2() tor supl porting this plate. The invention prefertherefrom,

ably takes this form when a boiler is encountered having no large central .flue 17, but the objects of the baille and the tube 1 '13 are. the same in this instance as have .1. A boiler of Vthe character described having a plurality of vertical ues, a tube disposedwithin said4f boiler and above said ues, a baiile below said tube and spaced the total of the circumferential larea between said baffle and said lues being A an area substantially e ual to the cross sectionalkarea of all of sai dues covered by the bathe.

2. A boiler of the character described having a pluralityof vertical tlues, a tube/ positioned above said luesya baille' low the tube and overlyingfafnumberof the fiues, 'the circumferential are( of the space between the bathe and/'said ilues. being substantially equal to 'the combined cross sectional area'f ,all of said tlues covered' by V.the baiile.

' 3. A steam boiler having a lurality of flues and a water chamber, saidlboiler bein provided with a smoke box, a tube dis o within the smoke box and eXtendi i low the water line of the boiler. fordisc arging the .intensely heated gases from within the smoke box at a point substantially below said water line, a baffle spaced'. from the lower edge of the v,tube and adaptci'to prosaid baille being spaced from the upper edges of the flues covered thereby for the purpose described.

In testimony 'whereof I axjny signature.

. ,Gatineau HUNTER..

ject over at least one row of the fl'ues, the 

